/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* Generated By:JJTree: Do not edit this line. AstFunction.java */

package org.apache.el.parser;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import javax.el.ELException;
import javax.el.FunctionMapper;

import org.apache.el.lang.EvaluationContext;
import org.apache.el.util.MessageFactory;

/**
 * @author Jacob Hookom [jacob@hookom.net]
 * @version $Id: AstFunction.java 939519 2010-04-30 00:12:23Z kkolinko $
 */
public final class AstFunction extends SimpleNode {

	protected String localName = "";

	protected String prefix = "";

	public AstFunction(int id) {
		super(id);
	}

	public String getLocalName() {
		return localName;
	}

	public String getOutputName() {
		if (this.prefix == null) {
			return this.localName;
		} else {
			return this.prefix + ":" + this.localName;
		}
	}

	public String getPrefix() {
		return prefix;
	}

	public Class getType(EvaluationContext ctx) throws ELException {

		FunctionMapper fnMapper = ctx.getFunctionMapper();

		// quickly validate again for this request
		if (fnMapper == null) {
			throw new ELException(MessageFactory.get("error.fnMapper.null"));
		}
		Method m = fnMapper.resolveFunction(this.prefix, this.localName);
		if (m == null) {
			throw new ELException(MessageFactory.get("error.fnMapper.method",
					this.getOutputName()));
		}
		return m.getReturnType();
	}

	public Object getValue(EvaluationContext ctx) throws ELException {

		FunctionMapper fnMapper = ctx.getFunctionMapper();

		// quickly validate again for this request
		if (fnMapper == null) {
			throw new ELException(MessageFactory.get("error.fnMapper.null"));
		}
		Method m = fnMapper.resolveFunction(this.prefix, this.localName);
		if (m == null) {
			throw new ELException(MessageFactory.get("error.fnMapper.method",
					this.getOutputName()));
		}

		Class[] paramTypes = m.getParameterTypes();
		Object[] params = null;
		Object result = null;
		int numParams = this.jjtGetNumChildren();
		if (numParams > 0) {
			params = new Object[numParams];
			try {
				for (int i = 0; i < numParams; i++) {
					params[i] = this.children[i].getValue(ctx);
					params[i] = coerceToType(params[i], paramTypes[i]);
				}
			} catch (ELException ele) {
				throw new ELException(MessageFactory.get("error.function", this
						.getOutputName()), ele);
			}
		}
		try {
			result = m.invoke(null, params);
		} catch (IllegalAccessException iae) {
			throw new ELException(MessageFactory.get("error.function", this
					.getOutputName()), iae);
		} catch (InvocationTargetException ite) {
			throw new ELException(MessageFactory.get("error.function", this
					.getOutputName()), ite.getCause());
		}
		return result;
	}

	public void setLocalName(String localName) {
		this.localName = localName;
	}

	public void setPrefix(String prefix) {
		this.prefix = prefix;
	}

	public String toString() {
		return ELParserTreeConstants.jjtNodeName[id] + "["
				+ this.getOutputName() + "]";
	}
}
